// --------------------------------------------------------------------------------------------------------------------
// <copyright file="NameValuePairList.cs" company="">
//   
// </copyright>
// <summary>
//   Defines the NameValuePairList type.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

#region

using System;
using System.Collections;

#endregion

namespace NFit.Core.Html
{
    internal class NameValuePairList
    {
        private readonly ArrayList _allPairs;
        private readonly Hashtable _pairsWithName;
        internal readonly string Text;

        internal NameValuePairList() :
            this(null)
        {
        }

        internal NameValuePairList(string text)
        {
            Text = text;
            _allPairs = new ArrayList();
            _pairsWithName = new Hashtable();

            Parse(text);
        }

        internal string GetNameValuePairValue(string name)
        {
            if (name == null)
                throw new ArgumentNullException();
            ArrayList al = GetNameValuePairs(name);
            if (al == null)
                return null;

            // return first item
            NameValuePair nvp = al[0] as NameValuePair;
            return nvp.Value;
        }

        internal ArrayList GetNameValuePairs(string name)
        {
            if (name == null)
                return _allPairs;
            return _pairsWithName[name] as ArrayList;
        }

        private void Parse(string text)
        {
            _allPairs.Clear();
            _pairsWithName.Clear();
            if (text == null)
                return;

            string[] p = text.Split(';');
            if (p == null)
                return;
            foreach (string pv in p)
            {
                if (pv.Length == 0)
                    continue;
                string[] onep = pv.Split(new[] {'='}, 2);
                if (onep == null)
                    continue;
                NameValuePair nvp = new NameValuePair(onep[0].Trim().ToLower());
                if (onep.Length < 2)
                    nvp.Value = string.Empty;
                else
                    nvp.Value = onep[1];

                _allPairs.Add(nvp);

                // index by name
                ArrayList al = _pairsWithName[nvp.Name] as ArrayList;
                if (al == null)
                {
                    al = new ArrayList();
                    _pairsWithName[nvp.Name] = al;
                }

                al.Add(nvp);
            }
        }

        internal static string GetNameValuePairsValue(string text, string name)
        {
            NameValuePairList l = new NameValuePairList(text);
            return l.GetNameValuePairValue(name);
        }
    }
}